Preheat oven to 190C/375F. Line muffin tins with papers or grease liberally. Dissolve the coffee powder in hot water. Set aside to cool. In a large mixing bowl, whisk together flour, cocoa powder and baking powder. Set aside.

Beat butter in large bowl until creamy. Gradually add in sugar and beat until fluffy and light in colour. Add in eggs, one at a time, blending well after each addition. Mix in rum extract. Alternately add in flour mixture and prepared coffee. Stir only until combined. Do not over-mix.

Fill muffin cups 4/5 full and top with 3 hazelnuts. Bake 25 minutes. Transfer the muffins on a wire rack. Combine together the powdered sugar and instant coffee. Add in hot water and stir until smooth. Drizzle the glaze across the top of each muffin and leave to set before serving.

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